Liquid fuel burning tobacco curing furnace



July 24, 19 w. L. JOHNSON LIQUID FUEL BURNING Filed June 15, 1946 TOBACCO CURING FURNACE 3 Sheets-Sheet l INVENTOR. W. L. JOHNSON ATTORNEY y 1951 w. L. JOHNSON 2,561,799

LIQUID FUEL BURNING TOBACCO CURING FURNACE Filed June 13, 1946 3 Sheets-Sheet 2 IN V EN TOR.

ATTORNEY July 24, 1951 w. JOHNSON LIQUID FUEL BURNING TOBACCO CURING FURNACE Filed June 15, 1946 3 Sheets-Sheet 3 N 0. W06. .1 N mu m0 J L w VATTORNEY Patented July 24, 1951 LIQUID FUEnBURNINdrroBAoco.oUaING FUaN rcE; a William L. Johnsong Lumberto'n; N. C. Application June 13, 194t;-s ria1No.c7s,444

' *This invention'relates tofurnacesyeirfdinore Claim. (ounc -9s) particularly to a fuel burner for simply; economically, and efficiently heating atobacco barn,

* in which tobacco is collected and cured prior its'use in the manufacture of tobacco products.

Tobacco barns have been heated in various *ways; including with furnaces to which fuel t "supplied manually. if Numerous attempts also *have been made to heat barns with furnaces employing fluid fuel; However, efforts to provide the dsired heating have not been entirely satisfactory,

'--due to cost, labor, inefficiency of operation, or

i 'complicated nature of structure and operation. It is anobject 'of the invention to provide relatively simple,-inexpensive, structure, capable t of being easily installedand operated, and designedvfor maximumflefliciency, with wearing -mpartswhich may. be. easilyrenewed, and con- :.structed to requireminimum care in its use;

:"lFurther objects and advantages of the inven xption will be apparent from the following description, taken in conjunction with the accompany- :1 ing drawings, 1 wherein:

which the oil or liquid fuel is burnedymay be supported in any desired manner. However, as illustrated, three brackets or lugs 24 which 'form a part of the lower casing 10 are disclosed.

' .Fig. 1 is a front elevation, illustrating one ap- 1 plication of the invention;

@Fig. 2, an. end elevation substantiallyat right 1 {angles to that of Fig. 1;

. Fig. 3,.a vertical section on line 3-3 of Fig. 2; .Fig. 4,.a section on the line 4-4 of Fig. 3; and,

. Fig.5, a detailed perspective of a baiile or parti- ;..tion member.

Briefly stated, the inventioncomprises an upright housing or casing of two horizontal sections'. The lower section of the casing supports a fire-pot in the form. of. an annular channel member for containing fuel oil, The oil is supplied to the fire-pot by valve controlled pipeline.

This fire-pot has a relatively short annular inner wall andataller outer wall havingan outwardly flaring, portion extendedto. provide a series of stepped portions having spaced apertures for the admission of air in an inward and an upward di- 1 .rection for combining with the fuel in the process I of combustion. An innercentral down draft pipe is employed for the admission of air. downwardly against a baffle plate to the fire-pot.

.With continued reference to the drawings and more particularly to Figs. 1 and 2 the invention comprises a lower annular. casing or housing It .which. supports the upper cylindrical casing or housing II. in which the combustion chamber 12 islocated and through which the heated gases pass into pipe [3. There is a down draft or air HsupplyQpipe. 14 extending .from thef'exterior through said combustion chamber. The down draft pipe is adjustably fastened to the upper g easing ll by setiscrews l; The lowercasin'g l0 is equipped with a door 16 for easy access to H the hollow channel receptacle or fire-pot H in which the oil isignited as well as to the other interiorparts of. the burner.

Openings [Bare arranged in the lower casing toallow the air to flow through. the channel ring I1 into the combustion chamber I2."The

oil issupplied to the burner through pipe line 19 controlled. by means of valve 20. The end wall f2! of the upper casing II is equipped. with a doOriZZ .pivotally connected therewithby'bolt 23 toallow access into the combustion chamber l2.

With reference to Fig. 3, the circular channel or .trofugh shaped receptacle or fire-potdl, in

1 The construction by means of which the necessaryiair is'supplied to the combustion chamber is an importantpart of the present invention.

Means is provided for supplying theairfor cofminglingwith the fuel upwardly from the base 25 through large openings 1 8 in the said'lower casing irandthen through thesmall apertures 25 and26 in thje channel ring or fire-pot l1 and downwardly throughthe down draft pipe 14 againstthe'partition member or baiile'plate 21 and thenthrough *the'small apertures 28 in the channel ring or fire-pot llinto the combustion chamber; The

' channel'shaped fuel-receptacle or fire-pot I1 is mounted concentrically within the lower casing near the bottom of the same and is adapted so that part of theair which is admitted'from the downdraft pipe and part of theair whichis admitted through the lower casing is directed outwardly through thecenter of the channelring or fire-pot I'l into the combustion chamber l2 "for co-mingling with the fuel during the comthe inner -wall of the annular channel ring or bustion-ther'eof. A baffle plate 21 issupported on T flre-pot l'l'. The baffle plate inturn supports an uprightdown draft pipe or tubular member M.

The air passes downwardly through the down draftpipe 14 until it strikes bafiie plate 21", then it proceeds laterally from the lowerend of the saidpipe to the combustion chamber lz adja- ;qwcent the surface of thefuel in theflre-spot ll.

The annular channel member or-fire-pot l1 has its outer wall flaring upwardly and outwardly to 'provide a series of stepped-portions; The

stepped portions are likewise provided with a series of apertures 25, and. 26 through which air nlay. flow upwardly. and inwardly in aimanner such that combustion may occur adjacent to the top of the circular channel member II. This manner of supplying the air both laterally and vertically has proved most effective in the economical utilization of the fuel.

The lower section of the casing I is provided with a door l6 supported by a pair of arms 29 which extend behind the wall of the lower section so that thedoor 16 will remain in place'by the effect of. gravity and may be easily detached. A handle 30 is provided centrally of the upper portion of the door for easy removal of the entire 7 door. The door is preferablyenlarged from bot tom to top as shown so that the fire-pot l'l maybe inserted or removed therethrough. The'cas ing surrounding the combustion-chamber may be formed of appropriate sections including a lower casing section Ill provided with a base ring 3| and an upper casing section H provided. with an upper base ring 32. The base ring for the upper section is adapted to rest upon the upper edge of the lower casing section or formed integrally with either of the sections if desired.

The upper casing section I I also may be of. any

desired configuration. However, for simplicity it may be formed of a combination of vertical or horizontal cylinders or casing members as shown particularly in Figs. 1 and 2. The cylinders are joined together as illustrated. A pipe [3 to carry away the heated gas and other products of combustion may be inserted over one end of the horizontal cylinder. Such pipe is extended through a tobacco barn or other structure desired to be heated.

The admission of air into the upper end of thedown draft pipe l4 may be controlled by an appropriate type of butterfly valve or in any desired manner.

Fig. 5 is an enlarged perspective view of the baiiie partition member 21 showing the details 40 of its construction, the said partition member being constructed of a flat circular plate supported by four braces 33. These braces extend above and below the said plate in such a manner to allow the passage of air inwardly into the firepot I! when it comes in contact with the said' baflle plate partition either from above through the down draft pipe I4 or from below through the openings! in the lower casing section 10, and through the central vertical passage formed by the inner wall of the trough of the fire pot.

In operation oil is admitted into the annular like manner butterfly valve in the top of the down draft pipe 14 may be set to control the flow of air therethrough.

It will be obvious to those skilled in the art that various changes may be made in the invention without departing from the spirit and scope thereof and therefore the invention is not limited by that which is shown; in the, drawings and described in the specif cation but only as indicated in the appended claim.

What is claimed is:

An oil burning furnace comprising an upstanding housing, a plurality of spaced supporting lugs mounted on the inner periphery of said housing, a horizontally disposed fire pot positioned in said housing, said fire pot including an oil receiving troughhaving inner and outer walls forming a continuous trough, said inner wall being formed to provide a central vertical passage. open at its upper and lower ends, an upwardly and outwardly flaring portion extending from the outer,wall

I air supply pipe having its lower end mounted on of said trough toward and terminating shortof the inner. periphery of said housing and resting on said lugs, a horizontally disposed partition member having vertically extending bracesat the outer periphery of and extending above and be low said partition, said partition member; being mounted with the lower portions of said braces engaging on the upper edge of the inner wallof the said trough whereby said partition member is spaced above the upper edge of the said inner wall, a vertically elongated downwardly extending the upwardly extending portions of said braces whereby said air supply pipe is spaced above said partition, said housing being formed adjacent its bottom with openings through the periphery thereof for supplying air below said fire pot, said upwardly and outwardly flaring'portion of'said fire pot being provided with apertures extending therethrough for the admission of air to said fire pot, the outer wall of said trough being provided with apertures for the admission of air, whereby some of the air passing through said openings *in' said housing passes through said'central vertical passage of said trough and'whereby' other of said air passes through the apertures in said'trough channel or fire-pot I! by means of a supply pipe l9 and is ignited. Air to support the combustion will pass downwardly through the down draft pipe I4 and be discharged laterally into the firepot. Additional air will pass'through the aperture l8 into the lower casing I0. Some of this air will pass into the center of the annular channel member i! and be discharged outwardly through apertures 28 into the fire-pot or combustionchamber while additional air will pass upwardly and through the horizontal apertures adjusts 26 and vertical apertures 25 into the combustion chamber l2.

Should oil in the channel member or fire-pot I! overflow no harm will be accomplished. The

ignition of this oil will merely serve toincrease the heat within the lower section of, the casing and assist in evaporation. As a safety precaution, there is provided an overflow pan 34 for catching and holding such overflow oil until it has been ignited.

The hand valve 20 in the supply line may be to control the proper supply of oil and in and flaring portion of said fire pot and air passing downwardly through said air supply pipepasses between the lower end of said air supplypipe and said partition into the fire pot. I V

WILLIAM L. Ol-liNs Ol REFERENCES cITED v The following referencesare of record inthe file of this patent:

UNITED STATES PATENTS 2,444,814 Dowless July 6, (19 48 

